Kamal: How to use Grafana Loki as a logging driver

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data-author-id="51393" data-author-name="Eduardo Lomeli" data-author-username="eduardinni" data-co-author-ids="" data-path="/eduardinni/kamal-how-to-use-grafana-loki-as-a-logging-driver-1hdc" data-pin-path="/stories/feed/pinned_article" data-pinned-article-id="" data-published="true" data-scheduled="false" lang=en > <header class="crayons-article__header" id="main-title"> <div class="crayons-article__header__meta"> <div class="flex s:items-start flex-col s:flex-row"> <div id="action-space" class="crayons-article__actions mb-4 s:mb-0 s:order-last"></div> <div class="flex flex-1 mb-5 items-start"> <div class="relative"> <a href="/eduardinni"><img class="radius-full align-middle" src="https://media2.dev.to/dynamic/image/width=50,height=50,fit=cover,gravity=auto,format=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F51393%2F26a98cea-fb64-4ed4-abd2-9783ded31c6e.jpg" width="40" height="40" alt="Eduardo Lomeli" /></a> </div> <div class="pl-3 flex-1"> <a href="/eduardinni" class="crayons-link fw-bold">Eduardo Lomeli</a> <p class="fs-xs color-base-60"> Posted on <time datetime="2024-11-10T07:14:27Z" class="date">Nov 10, 2024</time> </p> </div> </div> </div> <h1 class=" fs-3xl m:fs-4xl l:fs-5xl fw-bold s:fw-heavy lh-tight mb-2 medium"> Kamal: How to use Grafana Loki as a logging driver </h1> <div class="spec__tags flex flex-wrap"> <a class="crayons-tag " style=" --tag-bg: rgba(59, 73, 223, 0.10); --tag-prefix: #3b49df; --tag-bg-hover: rgba(59, 73, 223, 0.10); --tag-prefix-hover: #3b49df; " href="/t/kamal"><span class="crayons-tag__prefix">#</span>kamal</a> <a class="crayons-tag " style=" --tag-bg: rgba(204, 0, 0, 0.10); --tag-prefix: #cc0000; --tag-bg-hover: rgba(204, 0, 0, 0.10); --tag-prefix-hover: #cc0000; " href="/t/rails"><span class="crayons-tag__prefix">#</span>rails</a> </div> </div> </header> <div class="crayons-article__main "> <nav class="series-switcher crayons-card crayons-card--secondary"> <header class="crayons-card__header"> <h2 class="crayons-subtitle-2"> <a href="/eduardinni/series/29401">Kamal Guides (3 Part Series)</a> </h2> </header> <div class="series-switcher__list"> <a href="/eduardinni/kamal-how-to-integrate-with-github-actions-with-multiple-destinations-3gmm" class="crayons-link crayons-link--contentful series-switcher__link " data-preload-image="" title="Published Nov 10 '24"> <span class="series-switcher__num">1</span> <span class="series-switcher__title">Kamal: How to integrate with GitHub Actions using multiple destinations</span> </a> <a href="/eduardinni/kamal-how-to-use-grafana-loki-as-a-logging-driver-1hdc" class="crayons-link crayons-link--contentful series-switcher__link series-switcher__link--active " data-preload-image="" title="Published Nov 10 '24"> <span class="series-switcher__num">2</span> <span class="series-switcher__title">Kamal: How to use Grafana Loki as a logging driver</span> </a> <a href="/eduardinni/kamal-speed-up-the-image-builds-using-managed-third-party-builders-and-github-actions-40bj" class="crayons-link crayons-link--contentful series-switcher__link " data-preload-image="" title="Published Nov 10 '24"> <span class="series-switcher__num">3</span> <span class="series-switcher__title">Kamal: Speed up the image builds using managed third-party builders and GitHub Actions</span> </a> </div> </nav> <div class="crayons-article__body text-styles spec__body" data-article-id="2091971" id="article-body"> <p>You can easily configure <a href="https://grafana.com/oss/loki/" target="_blank" rel="noopener noreferrer">Grafana Loki</a> as a logging driver in your <a href="https://kamal-deploy.org/" target="_blank" rel="noopener noreferrer">Kamal</a> deployments.</p> <p>In this guide I'm using Grafana Cloud and <a href="https://grafana.com/docs/loki/latest/send-data/docker-driver/" target="_blank" rel="noopener noreferrer">Loki Docker driver client</a>.</p> <h2> <a name="install-loki-docker-driver-in-your-kamal-hosts" href="#install-loki-docker-driver-in-your-kamal-hosts"> </a> Install Loki Docker driver in your Kamal hosts </h2> <p>This step can be automated using Kamal <code>docker-setup</code> hook. Which runs right after Docker is installed, usually when you run <code>kamal setup</code>.</p> <h3> <a name="-raw-dockersetup-endraw-" href="#-raw-dockersetup-endraw-"> </a> <code>docker-setup</code> </h3> <p>This script example is prepared to use multiple destinations.</p> <p>File location: <code>.kamal/hooks/docker-setup</code><br> </p> <div class="highlight js-code-highlight"> <pre class="highlight shell"><code><span class="c">#!/bin/sh</span> <span class="nb">echo</span> <span class="s2">"Docker set up on </span><span class="nv">$KAMAL_HOSTS</span><span class="s2">. Destination </span><span class="nv">$KAMAL_DESTINATION</span><span class="s2">"</span> <span class="c"># Check if the Loki Docker Driver plug-in is already installed</span> <span class="k">if</span> <span class="o">!</span> kamal server <span class="nb">exec</span> <span class="s2">"docker plugin ls"</span> <span class="nt">-d</span> <span class="nv">$KAMAL_DESTINATION</span> | <span class="nb">grep</span> <span class="nt">-q</span> <span class="s2">"loki"</span><span class="p">;</span> <span class="k">then </span><span class="nb">echo</span> <span class="s2">"Installing Loki Docker Driver plug-in..."</span> kamal server <span class="nb">exec</span> <span class="se">\</span> <span class="s2">"docker plugin install grafana/loki-docker-driver:2.9.2 --alias loki --grant-all-permissions"</span> <span class="se">\</span> <span class="nt">-d</span> <span class="nv">$KAMAL_DESTINATION</span> <span class="k">else </span><span class="nb">echo</span> <span class="s2">"Loki Docker Driver plug-in is already installed."</span> <span class="k">fi</span> </code></pre> <div class="highlight__panel js-actions-panel"> <div class="highlight__panel-action js-fullscreen-code-action"> <svg xmlns="http://www.w3.org/2000/svg" width="20px" height="20px" viewbox="0 0 24 24" class="highlight-action crayons-icon highlight-action--fullscreen-on"><title>Enter fullscreen mode</title> <path d="M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z"></path> </svg> <svg xmlns="http://www.w3.org/2000/svg" width="20px" height="20px" viewbox="0 0 24 24" class="highlight-action crayons-icon highlight-action--fullscreen-off"><title>Exit fullscreen mode</title> <path d="M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z"></path> </svg> </div> </div> </div> <h2> <a name="configure-kamal-logging-driver" href="#configure-kamal-logging-driver"> </a> Configure Kamal logging driver </h2> <h3> <a name="-raw-deployyaml-endraw-" href="#-raw-deployyaml-endraw-"> </a> <code>deploy.yaml</code> </h3> <div class="highlight js-code-highlight"> <pre class="highlight yaml"><code><span class="na">logging</span><span class="pi">:</span> <span class="na">driver</span><span class="pi">:</span> <span class="s">loki</span> <span class="na">options</span><span class="pi">:</span> <span class="na">loki-url</span><span class="pi">:</span> <span class="s">https://<user_id>:<password>@logs-us-west1.grafana.net/loki/api/v1/push</span> <span class="na">loki-batch-size</span><span class="pi">:</span> <span class="s2">"</span><span class="s">400"</span> </code></pre> <div class="highlight__panel js-actions-panel"> <div class="highlight__panel-action js-fullscreen-code-action"> <svg xmlns="http://www.w3.org/2000/svg" width="20px" height="20px" viewbox="0 0 24 24" class="highlight-action crayons-icon highlight-action--fullscreen-on"><title>Enter fullscreen mode</title> <path d="M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z"></path> </svg> <svg xmlns="http://www.w3.org/2000/svg" width="20px" height="20px" viewbox="0 0 24 24" class="highlight-action crayons-icon highlight-action--fullscreen-off"><title>Exit fullscreen mode</title> <path d="M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z"></path> </svg> </div> </div> </div> </div> <nav class="series-switcher crayons-card crayons-card--secondary"> <header class="crayons-card__header"> <h2 class="crayons-subtitle-2"> <a href="/eduardinni/series/29401">Kamal Guides (3 Part Series)</a> </h2> </header> <div class="series-switcher__list"> <a href="/eduardinni/kamal-how-to-integrate-with-github-actions-with-multiple-destinations-3gmm" class="crayons-link crayons-link--contentful series-switcher__link " data-preload-image="" title="Published Nov 10 '24"> <span class="series-switcher__num">1</span> <span class="series-switcher__title">Kamal: How to integrate with GitHub Actions using multiple destinations</span> </a> <a href="/eduardinni/kamal-how-to-use-grafana-loki-as-a-logging-driver-1hdc" class="crayons-link crayons-link--contentful series-switcher__link series-switcher__link--active " data-preload-image="" title="Published Nov 10 '24"> <span class="series-switcher__num">2</span> <span class="series-switcher__title">Kamal: How to use Grafana Loki as a logging driver</span> </a> <a href="/eduardinni/kamal-speed-up-the-image-builds-using-managed-third-party-builders-and-github-actions-40bj" class="crayons-link crayons-link--contentful series-switcher__link " data-preload-image="" title="Published Nov 10 '24"> <span class="series-switcher__num">3</span> <span class="series-switcher__title">Kamal: Speed up the image builds using managed third-party builders and GitHub Actions</span> </a> </div> </nav> <div class="js-billboard-container body-billboard-container" data-async-url="/eduardinni/kamal-how-to-use-grafana-loki-as-a-logging-driver-1hdc/bb-2/post_body_bottom"></div> </div> <section id="comments" 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